1st turn hunter loop almost always, sends 5 cards in OPP's hand to the grave.

Not if they went first XD

I still don't understand the loop.. If I remember right it requires hunter and rat.

you have zenmaighty on the field and hunter in the grave or attached to zenmaighty. You use zen eff to summon rat(if hunter is attached detach at this time) then rat eff summon hunter from grave. Tribute zen with hunter, your opponent sends 1 card from hand to grave, xyz summon using rat and hunter to make zen and repeat. Then once you run out of zenmaightys you summon any other rank 3 of your choice(most go for zenmaines) And with the release of shark you can xyz summon for emerald and restart the whole loop